OSPF and stub-areas

One general question.

If I define a stub area (Router A (ABR) and normal stub area router B) how can I inject the intra-area routes into the backbone area?

I thought that defining the area-ranges on A but this will not work. I got no route of the connected networks on the “normal” router B in the Backbone Area.


Backbone <-A->StubArea<->B<->Network

You need to create Virtual Links, i.e. each router not directly connected to the backbone needs to know about it’s backbone conneced partner.

How does router B know the route to “Network”? Is it directly connected? Or a static route?

–Tom

Sorry for delayed answer. I had to reactivate my forum account…

The networks ares direct connected and others are with static routes.

A stub area can not announce routes from external (i.e. static, connected) networks
towards the OSPF backbone. You’d need either a normal, full-featured area or at
least a NSSA for that.

–Tom